Table 2.

Anatomical regions of the chicken intestine evaluated for lesions by the Johnson and Reid scoring system

Eimeria species	Region of infection/lesions
E. necatrix	Upper jejunum/middle ileum
E. maxima	Middle ileum/Meckel’s diverticulum
E. brunetti	Lower small intestine, basis of ceca, and rectum
E. tenella	Ceca
E. acervulina	Duodenal loop, through small intestine in heavy infections

Note: Data from Johnson and Reid.⁷⁴